Solution : https://service.sap.com/sap/support/notes/788272 (SAP Service marketplace login required)
Key words : 
text file busy sapdb migration, sqd<sid> database users thatstart, sqd<sid> database users, solution short-term solution, longer run maxdb versions 7, linux posix thread implementation, medium-term solution, run current releases, sap service marketplace, extract pgm/vserver [
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